<html>
<style>
    :root {
        --shimmer-hue-1: 213deg;
        --shimmer-sat-1: 95%;
        --shimmer-lit-1: 91%;
        --shimmer-hue-2: 248deg;
        --shimmer-sat-2: 100%;
        --shimmer-lit-2: 86%;
        --shimmer-hue-3: 293deg;
        --shimmer-sat-3: 78%;
        --shimmer-lit-3: 89%;

        --glow-hue: 222deg;
        --shadow-hue: 180deg;
        --spring-easing: linear ;
        --spring-duration: 1.33s;
    }
    @property --mask {
        syntax: "<angle>";
        inherits: false;
        initial-value: 33deg;
    }

    @-webkit-keyframes spin {
        0% {
            --mask: 0deg;
        }
        100% {
            --mask: 360deg;
        }
    }

    @keyframes spin {
        0% {
            --mask: 0deg;
        }
        100% {
            --mask: 360deg;
        }
    }

    @-webkit-keyframes wipe {
        0% {
            -webkit-mask-position: 200% center;
            mask-position: 200% center;
        }
        100% {
            -webkit-mask-position: 0 center;
            mask-position: 0  center;
        }
    }

    @keyframes wipe {
        0% {
            -webkit-mask-position: 200% center;
            mask-position: 200% center;
        }
        100% {
            -webkit-mask-position: 0 center;
            mask-position: 0 center;
        }
    }

    @-webkit-keyframes pulse {
        0%, 90%, 100% {
            opacity: 0;
        }
        20% {
            opacity: 1;
        }
    }

    @keyframes pulse {
        0%, 90%, 100% {
            opacity: 0;
        }
        20% {
            opacity: 1;
        }
    }

    @-webkit-keyframes pulse2 {
        0% {
            opacity: 0;
        }
        8% {
            opacity: 1;
        }
        14% {
            opacity: 0;
        }
        20% {
            opacity: 1;
        }
        100% {
            opacity: 0;
        }
    }

    @keyframes pulse2 {
        0% {
            opacity: 0;
        }
        8% {
            opacity: 1;
        }
        14% {
            opacity: 0;
        }
        20% {
            opacity: 1;
        }
        100% {
            opacity: 0;
        }
    }

    @-webkit-keyframes flicker {
        0% { opacity:0.1; -webkit-mask-image:none; mask-image:none;}
        1% { opacity:1; }
        2% { opacity:0.5; }
        3% { opacity:0.1; }
        4% { opacity:0.7; }
        5% { opacity:1; }
        7% { opacity:0.7;
            -webkit-mask-image: -webkit-linear-gradient(
                    90deg, transparent 15%, black 45%, black 55%, transparent 85%
            );
            mask-image: linear-gradient(
                    90deg, transparent 15%, black 45%, black 55%, transparent 85%
            ); }
        8% { opacity:0.1; }
        10% { opacity:0.4; }
        13% { opacity:1; }
        15% { opacity:0.1;
            -webkit-mask-image: -webkit-linear-gradient(
                    45deg, rgba(0,0,0,0.4) 25%, transparent 45%, black 65%, black 90%, transparent 100%
            );
            mask-image: linear-gradient(
                    45deg, rgba(0,0,0,0.4) 25%, transparent 45%, black 65%, black 90%, transparent 100%
            );}
        17% { opacity:0.8;}
        19% { opacity:0.3; }
        21.5% { opacity:0; }
        23% { opacity:1; }
        39% { opacity:0.7; }
        45% { opacity:0.2; }
        49% { opacity:0.9; }
        52% { opacity:0.7;}
        53.5% { opacity:0.2;
            -webkit-mask-image: -webkit-linear-gradient(
                    90deg, black 15%, black 45%, rgba(0,0,0,0.4) 75%, transparent 85%
            );
            mask-image: linear-gradient(
                    90deg, black 15%, black 45%, rgba(0,0,0,0.4) 75%, transparent 85%
            );}
        57% { opacity:0.8; }
        63% { opacity:1; }
        75% { opacity:.85; }
        77% { opacity:1; }
        80% { opacity:.9; }
        82% { opacity:.95; }
        83% { opacity:.85; }
        86% { opacity:1; }
        89% { opacity:.85; }
        91% { opacity:1; }
        92% { opacity:.9; }
        100% { opacity:1; }
    }

    @keyframes flicker {
        0% { opacity:0.1; -webkit-mask-image:none; mask-image:none;}
        1% { opacity:1; }
        2% { opacity:0.5; }
        3% { opacity:0.1; }
        4% { opacity:0.7; }
        5% { opacity:1; }
        7% { opacity:0.7;
            -webkit-mask-image: -webkit-linear-gradient(
                    90deg, transparent 15%, black 45%, black 55%, transparent 85%
            );
            mask-image: linear-gradient(
                    90deg, transparent 15%, black 45%, black 55%, transparent 85%
            ); }
        8% { opacity:0.1; }
        10% { opacity:0.4; }
        13% { opacity:1; }
        15% { opacity:0.1;
            -webkit-mask-image: -webkit-linear-gradient(
                    45deg, rgba(0,0,0,0.4) 25%, transparent 45%, black 65%, black 90%, transparent 100%
            );
            mask-image: linear-gradient(
                    45deg, rgba(0,0,0,0.4) 25%, transparent 45%, black 65%, black 90%, transparent 100%
            );}
        17% { opacity:0.8;}
        19% { opacity:0.3; }
        21.5% { opacity:0; }
        23% { opacity:1; }
        39% { opacity:0.7; }
        45% { opacity:0.2; }
        49% { opacity:0.9; }
        52% { opacity:0.7;}
        53.5% { opacity:0.2;
            -webkit-mask-image: -webkit-linear-gradient(
                    90deg, black 15%, black 45%, rgba(0,0,0,0.4) 75%, transparent 85%
            );
            mask-image: linear-gradient(
                    90deg, black 15%, black 45%, rgba(0,0,0,0.4) 75%, transparent 85%
            );}
        57% { opacity:0.8; }
        63% { opacity:1; }
        75% { opacity:.85; }
        77% { opacity:1; }
        80% { opacity:.9; }
        82% { opacity:.95; }
        83% { opacity:.85; }
        86% { opacity:1; }
        89% { opacity:.85; }
        91% { opacity:1; }
        92% { opacity:.9; }
        100% { opacity:1; }
    }

    @-webkit-keyframes shine {
        0% {
            opacity: 0;
        }
        15% {
            opacity: 1;
        }
        55% {
            opacity: 1;
        }
        100% {
            opacity: 0;
        }
    }

    @keyframes shine {
        0% {
            opacity: 0;
        }
        15% {
            opacity: 1;
        }
        55% {
            opacity: 1;
        }
        100% {
            opacity: 0;
        }
    }
    @-webkit-keyframes text {
        0% {
            background-position: 100% center;
        }
        100% {
            background-position: -100% center;
        }
    }
    @keyframes text {
        0% {
            background-position: 100% center;
        }
        100% {
            background-position: -100% center;
        }
    }

    .dark button {
        font-weight: 600;
        font-size: 1.2em;
        background-image: linear-gradient(
                315deg,
                hsl(var(--shimmer-hue-1),var(--shimmer-sat-1),var(--shimmer-lit-1)) 0.00%,
                hsl(var(--shimmer-hue-2),var(--shimmer-sat-2),var(--shimmer-lit-2)) 47%,
                hsl(var(--shimmer-hue-3),var(--shimmer-sat-3),var(--shimmer-lit-3)) 100.00%
        );
        padding: .8em 1.4em;
        position: relative;
        isolation: isolate;
        box-shadow: 0 2px 3px 1px hsl(var(--glow-hue) 50% 20% / 50%);
        border: none;
        outline: none;
        border-radius: 0.66em;
        scale: 1;
        transition: all var(--spring-duration)  linear(
                0, 0.002, 0.01 0.9%, 0.038 1.8%, 0.156, 0.312 5.8%, 0.789 11.1%, 1.015 14.2%,
                1.096, 1.157, 1.199, 1.224 20.3%, 1.231, 1.231, 1.226, 1.214 24.6%,
                1.176 26.9%, 1.057 32.6%, 1.007 35.5%, 0.984, 0.968, 0.956, 0.949 42%,
                0.946 44.1%, 0.95 46.5%, 0.998 57.2%, 1.007, 1.011 63.3%, 1.012 68.3%,
                0.998 84%, 1
        );
        /** 近似贝塞尔曲线为  cubic-bezier(0.25 , 0.1, 0.25,1) ;  */
        animation:  customSpring var(--spring-duration)   linear   infinite  ;
        @keyframes customSpring {
            0% { transform: scale(0); }
            0.9% { transform: scale(0.01); }
            1.8% { transform: scale(0.038); }
            5.8% { transform: scale(0.312); }
            11.1% { transform: scale(0.789); }
            14.2% { transform: scale(1.015); }
            20.3% { transform: scale(1.224); }
            24.6% { transform: scale(1.214); }
            26.9% { transform: scale(1.176); }
            32.6% { transform: scale(1.057); }
            35.5% { transform: scale(1.007); }
            42% { transform: scale(0.949); }
            44.1% { transform: scale(0.946); }
            46.5% { transform: scale(0.95); }
            57.2% { transform: scale(0.998); }
            63.3% { transform: scale(1.011); }
            68.3% { transform: scale(1.012); }
            84% { transform: scale(0.998); }
            100% { transform: scale(1); }
        }

        text-transform: unset;
    }

    .shimmer {
        position: absolute;
        inset: -40px;
        border-radius: inherit;
        mix-blend-mode: color-dodge;
        pointer-events: none;
    }

    .shimmer::before,
    .shimmer::after {
        transition: all 0.5s ease;
        opacity: 0;
        content: "";
        border-radius: inherit;
        position: absolute;
        inset: 40px;
    }
    .shimmer::before {
        box-shadow: 0 0 3px 2px hsl(var(--shimmer-hue-1) 20% 95%),
        0 0 7px 4px hsl(var(--shimmer-hue-1) 20% 80%),
        0 0 13px 8px hsl(var(--shimmer-hue-2) 40% 60%),
        0 0 22px 6px hsl(var(--shimmer-hue-2) 20% 40%);
        z-index: -1;
    }
    .shimmer::after {
        box-shadow: inset 0 0 0 1px hsl(var(--shimmer-hue-2) 70% 95%),
        inset 0 0 3px 1px hsl(var(--shimmer-hue-2) 100% 80%),
        inset 0 0 9px 1px hsl(var(--shimmer-hue-2) 100% 70%);
        z-index: 2;
    }

    button[disabled] {
        background: rgb(76 76 92) none;
    }
    button:hover:not(:active):not([disabled]) {
        scale: 1.1;
        transition-duration: calc(var(--spring-duration)*0.5);
    }
    button:active:not([disabled]) {
        scale: 1.05;
        transition-duration: calc(var(--spring-duration)*0.5);
    }
    button:focus .shimmer,
    button:active .shimmer {
        -webkit-animation-play-state: paused!important;
        animation-play-state: paused!important;
        -webkit-mask-image: none!important;
        mask-image: none!important;
    }
    button:hover:not([disabled]),
    button:hover:not([disabled]) .shimmer::before,
    button:hover:not([disabled]) .shimmer::after {
        opacity: 1;
    }


    button .text {
        color:  maroon ;
        -webkit-background-clip: text;
        background-clip: text;
        background-image: linear-gradient(120deg, transparent, hsla(var(--shimmer-hue-1),100%,80%,0.66) 40%, hsla(var(--shimmer-hue-2),100%,90%,.9) 50%, transparent 52%);
        background-repeat: no-repeat;
        background-size: 300% 300%;
        background-position: center 200%;
    }

    button:not([disabled]):hover .text {
        -webkit-animation: text 0.66s ease-in-out 1;
        animation: text 0.66s ease-in-out 1;
    }

    button:not([disabled]) .shimmer::before,
    button:not([disabled]) .shimmer::after {
        opacity: 1;
    }
    button:not([disabled]) .shimmer {
/*        -webkit-mask-image : conic-gradient(
                from var(--mask, 0deg),
                transparent 0%,
                transparent 10%,
                black 36%,
                black 45%,
                transparent 50%,
                transparent 60%,
                black 85%,
                black 95%,
                transparent 100%
        );*/
        mask-image: conic-gradient(
                from var(--mask, 0deg),
                transparent 0%,
                transparent 10%,
                black 36%,
                black 45%,
                transparent 50%,
                transparent 60%,
                black 85%,
                black 95%,
                transparent 100%
        );
        -webkit-mask-size: cover;
        mask-size: cover;
        -webkit-animation: spin 3s linear infinite both -0.5s;
        animation: spin 3s linear infinite both -0.5s;
    }
    button:not([disabled])[data-effect=wipe] .shimmer {
        -webkit-mask-image: -webkit-linear-gradient(
                90deg, transparent 20%, black 88%, transparent 90%
        );
        mask-image: linear-gradient(
                90deg, transparent 20%, black 88%, transparent 90%
        );
        -webkit-mask-size: 200% 200%;
        mask-size: 200% 200%;
        -webkit-mask-position: center;
        mask-position: center;
        -webkit-animation: wipe 1.5s linear infinite both -0.5s;
        animation: wipe 1.5s linear infinite both -0.5s;
    }
    button:not([disabled])[data-effect=wave] .shimmer {
        -webkit-mask-image: -webkit-linear-gradient(
                90deg, transparent 15%, black 45%, black 55%, transparent 85%
        );
        mask-image: linear-gradient(
                90deg, transparent 15%, black 45%, black 55%, transparent 85%
        );
        -webkit-mask-size: 200% 200%;
        mask-size: 200% 200%;
        -webkit-mask-position: center;
        mask-position: center;
        -webkit-animation: wipe 3s linear infinite both -0.5s;
        animation: wipe 3s linear infinite both -0.5s;
    }
    button:not([disabled])[data-effect=throb] .shimmer {
        -webkit-mask-image: none;
        mask-image: none;
        -webkit-animation: pulse 3s ease infinite both  -0.5s;
        animation: pulse 3s ease infinite both  -0.5s;
    }
    button:not([disabled])[data-effect=pulse] .shimmer {
        -webkit-mask-image: none;
        mask-image: none;
        -webkit-animation: pulse2 3s ease infinite both  -0.5s;
        animation: pulse2 3s ease infinite both  -0.5s;
    }
    button:not([disabled])[data-effect=flicker] .shimmer {
        -webkit-mask-image: none;
        mask-image: none;
        -webkit-animation: flicker 3.33s ease infinite both  -0.5s;
        animation: flicker 3.33s ease infinite both  -0.5s;
    }











    body,
    html {
        display: block;
        height: 100dvh;
        padding: 20px;
        margin: 0;
        background-image: radial-gradient(
                circle at 50% 0%,
                rgb(67, 54, 74) 16.4%,
                rgb(47, 48, 67) 68.2%,
                rgb(27, 23, 36) 99.1%
        );
    }
    main#app {
        display: flex;
        flex-direction: column;
        margin: auto;
        padding: 16px;
        align-items: center;
        justify-content: center;
        border-radius: 16px;
        box-sizing: border-box;
    }


    textarea {
        min-height: 100px;
        width: 100%;
        background: hsla(0deg,10%,10%,0.5);
        border: 1px solid hsla(0deg,10%,50%,0.5);
        border-radius: 8px;
        color: white;
        padding: 8px;
        box-sizing: border-box;
        font: inherit;
        resize: vertical;
    }

    .selection {
        margin: 20px auto;
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 16px;
    }
    .selection label {
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }

    p {
        font-size: 1.2rem;
        margin-top: 4em;
        opacity: 0.5;
        &:hover {
            opacity: 1;
        }
    }


</style>
<body>

<main id="app" class="dark">
    <button class="" data-effect="flicker">
        <span class="text">Hover me!</span>
        <span class="shimmer"></span>
    </button>

    <section class="selection">
        <label><input type="radio" name="style" value="spin"> spin</label>
        <label><input type="radio" name="style" value="wipe"> wipe</label>
        <label><input type="radio" name="style" value="flicker" checked=""> flicker</label>
        <label><input type="radio" name="style" value="wave"> wave</label>
        <label><input type="radio" name="style" value="throb"> throb</label>
        <label><input type="radio" name="style" value="pulse"> pulse</label>
    </section>
</main>

</body>
<script>
    let btn = document.querySelector("button");
    let radios = document.querySelectorAll("[type=radio]");

    radios[Math.floor(Math.random() * radios.length)].checked = true;

    radios.forEach(r => {
        r.onchange = e => {
            btn.dataset.effect = e.currentTarget.value;
            btn.classList.remove('textShine');
            window.requestAnimationFrame(() => {
                btn.classList.add('textShine');
            });
        };
        if (r.checked) {
            btn.dataset.effect = r?.value;
        }
    });
</script>
</html>




